I have these AFB0824GHE-R00 Fans in my hands, and I see that there are three wires on that fan. The + and -, and the third blue wire, which according to the datasheet's hint is a function wire?

fan function wire

function type

I am not sure how to use it. If I let it floating, the fans work as normal (I connect + and - to 24V and they spin), and I havent connect the blue wire to any voltage potential, as I may fry the fans by mistake.

So is this a wire that activates a "function" mode of the fan?

Where should I connect this wire to enable this mode, and what this mode does?

  • 1
    \$\begingroup\$ The datasheet does mention it. That link is just not the datasheet, but just some sales brochure. \$\endgroup\$
    – Justme
    Sep 9, 2021 at 8:27
  • 1
    \$\begingroup\$ @Justme yup, you're right. This one does mention it. \$\endgroup\$ Sep 9, 2021 at 8:28
  • 2
    \$\begingroup\$ Rotation detection R, open collector 00 \$\endgroup\$
    – Kartman
    Sep 9, 2021 at 8:29

1 Answer 1


According to the fan datasheet, that specific model has a motor lock detection, and the third wire is an open collector output of the lock detector.

It will be pulled low when motor runs, and high-z when motor is locked. Max ratings for external pull-up voltage and current are 26.4V and 5 mA.

If you don't intend to use the lock detection output, you don't need to connect it in any way.


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